How to scientifically determine the concession period is one of the focus problems for the project companies and government departments. In this paper,taking into account the average annual minimum expected return of the project company and the retained earning of the government department,compares two variables of the concession term(Tc)and the time point of traffic saturation(Tb),constructs the decision-making models of concession term for highway BOT project in two conditions of Tc≥Tb and Tc展开▼